Improvement in screw-wrenches



UNITED STATES PATENT OFFICE.

THOMAS H. DODGE, OF WASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT IN SCREW-WRENCHES.

Specitication forming part of Letters Patent No. 39,900, dated September 15, 1363; antedated April 8, 1863.

To all whom it may concern:

, Be it known that I, THOMAS H. DODGE, ot' the city and county of Washington, and District of Columbia, have invented a certain new and useful Improvement in Screw-Wrenches;

v and I do hereby declare that the following is which is provided with a small pinion or gear,

a, which meshes into an internal gear, b, cast with or connected to lthe rosette Gr, which is tted to turn freely on the fcrrule H. The rosette is kept in place on the circular part of the ferrule by means ot' pins or screws, c c c, which pass through the rosette into a groove, d, in the ferrule. I do not confine myself' to any particular mode of confining the rosette in place, since it may be accomplished in many different modes. If desired, small projections could be cast on the inside of the rosette to' fit the groove in the t'errule. 1n this case notches would have to be lett in the front of the ferrule to allow ot' the rosette being slipped into place, and one pin or screw used to keep the rosette from leaving the ferrule when its projections passed the notches in the front of ferrule. By the use of the ange e on the front of the rosette, the groove f in the bar'C can be dispensed with, since the said flange keeps lthe screw F in place. The gear on the end of the screw F can be made so small as to work entirely above the bar. Again, it' preferred, the flange of the rosette may be made wide enough to ertend into and work in a groove cut in the 4operating-screw just in front ot' its gear, and on the opposite side work against shoulders formed by turning of the corners of the bar. In thislast case the gear would have to work in agroovef, which would keep the screw in place, while the iiange e, working in a groove in the screw and against shoulders on the bar, would keep the rosette in place, and thus dispense with pins and grooves in the rosette and ferrule.

By the above construction the sliding jaw can be operated with great ease and rapidity. The operator can move the rosette in whatever position the wrench may be held without turning it in his hand. Again, if desired, the jaw can be moved by rolling the rosette against any suiicient unyielding surface.

Having described my improved wrench, what I claim as my invention, and desire to secure under this patent, is-

l. Providing the rear end of the operatingscrew with a small gear or pinion, in combination with the use of an internal gear on the rosette, substantially as and for the purposes set forth.

2. Contining the rosette to the ferrule, substantially as described, in combination with the use of the flan ge e, for the purposes stated.

THOMAS H.4 DODGE.

Witnesses JOHN P. JAcoBs, EDM. F. BROWN. 

